21220312201 has 24 divisors (see below), whose sum is σ = 23681677824. Its totient is φ = 18998100000.

The previous prime is 21220312189. The next prime is 21220312229. The reversal of 21220312201 is 10221302212.

It is a happy number.

It is not a de Polignac number, because 21220312201 - 2⁹ = 21220311689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220312301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2329666 + ... + 2338756.

It is an arithmetic number, because the mean of its divisors is an integer number (986736576).

Almost surely, 2^21220312201 is an apocalyptic number.

It is an amenable number.

21220312201 is a deficient number, since it is larger than the sum of its proper divisors (2461365623).

21220312201 is a wasteful number, since it uses less digits than its factorization.

21220312201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9405 (or 9394 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21220312201 its reverse (10221302212), we get a palindrome (31441614413).

The spelling of 21220312201 in words is "twenty-one billion, two hundred twenty million, three hundred twelve thousand, two hundred one".